Degradability of elephant grass Guaçu and Tanzania guinea grass sampled as extrusa and hand-plucked

Authors

  • Flávia Fernanda Simili Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios do Centro Leste, Ribeirão Preto, SP
  • Nilson Carlos Lima Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP
  • Maria Lúcia Pereira Lima Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios do Centro Leste, Ribeirão Preto, SP
  • Andréa Luciana dos Santos Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Pirassununga, SP
  • Paulo Roberto Leme Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Pirassununga, SP
  • Telma Teresinha Berchieli Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP

Keywords:

degradation rate, Panicum maximum, Jacq. cv. Tanzania, Pennisetum purpureum Schum. cv. Guaçu

Abstract

The trial was carried through at APTA Regional, Ribeirao Preto, SP, to compare the degradability of dry matter (DM) and neutral detergent fiber (NDF) of elephant grass Guaçu and Tanzania guinea grass sampled from extrusa and hand-plucked. The pasture management was rotational grazing. Five rumen-canulated milked cows were used for thetrial at some different times. The soluble fraction (A), the insoluble fraction potentially degradable (B), degradation rate (Kd) and the effective degradation (ED) was estimated. The statistical analysis was made considering a factorial 2x2 and split plot design (two years). There were interaction between years and grass species and sample way. The Guaçu presented higher (P<0.01) B fraction than Tanzania just for the 1st year (68.26 and 63.90% of DM) but no difference was found on the 2nd year (63.30 and 63.07% of DM). No effect of grass species was found for the other studied variables. The fraction A (% of DM), Kd(%/h) and ED5%/h (% of DM) were 14.01; 14.68; 3.21; 3.28; 40.54 and 39.05 on the 1st year and 18.01; 16.48; 2.81; 2.83; 39.34 and 39.16 on the 2nd year for the Guaçu and Tanzania, respectively. For DM, the extrusa samples presented higher results for all variables except the B fraction, for the two years. The NDF of B fraction was higher (P<0.01) for the Guaçu than Tanzania both years. No difference was found for the other variable. The extrusa presented higher B fraction and DE just or the 2nd year. The climatic conditions of the year influenced the ruminal degradation of grass species and the extrusa samples present higher in situ degradability than hand-plucked samples.

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Published

2007-04-22

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Degradability of elephant grass Guaçu and Tanzania guinea grass sampled as extrusa and hand-plucked. (2007). Bulletin of Animal Husbandry, 64(4), 311-319. http://bia.iz.sp.gov.br/index.php/bia/article/view/1219

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